| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | |
| 1 | Very much difficult | 6 |
12%
|
| 2 | Moderately difficult | 16 |
32%
|
| 3 | Somewhat difficult | 15 |
30%
|
| 4 | Not difficult at all | 13 |
26%
|